Feature request: One array available in more than one group, or under several names.

[adrianloy]

I would like to be able to request one array either under two different names in one group, or have the same array be part of two groups at the same time. The use case is to have different splits of the data (e.g. 5 fold split, and a simple train/test split) and different people want to be able to "query" for arrays using either splitting logic a or splitting logic b.

So I would like to be able to retrieve the same array in a group either via root['/dataset/train/array1'] or via root['/dataset/split1/array1']. Alternatively, have two different groups where the exact same array is part of.

Am I missing how to solve this via zarr right now? Do you think its a usefull feature? I can also build and managa an index over my files in a different object, but it seems desireable if I could do this via zarr directly.

[joshmoore]

see also:

• Follow symbolic links in DirectoryStore #298
• Supporting links and references #389